The CHANEL designer - who is renowned for his signature high collar - created the neckwear out of metallic leather and included 40 carats of black diamonds with a 22.33 carat emerald as the centrepiece and said the piece is a ''show-stopper''.

He explained: ''I'm renowned for my love of a high collar and I wanted to create a true collector's item with this one-off piece. Merging the masculine with the feminine and uniting the world of fine jewellery and high fashion, to me this collar is a work of art and a real show-stopper.''

The piece will be part of an exhibit curated by Vogue jewellery editor Carol Woolton at the Masterpiece London Fair from June 27th-July 4th.

Meanwhile it was recently revealed that Karl has teamed up with Japanese beauty giant Shu Uemure to create a range of cosmetics, for a one-off beauty line entitled Karl Lagerfeld for Shu Uemura.

While specific details on the range have not yet been made public, president of Karl Lagerfeld Pier Paolo Righi said the products will reflect the designer's ''iconic, ironic style''.

Karl - who has used Shu Uemura cosmetics to hand-colour his fashion sketches for over two decades - is in charge of the collection's colour selection and packaging and has already photographed an accompanying campaign.